Because shapes with parallel sides are weak. Triangular sides are more stable - which is why the steel infrastructure in buildings and bridges etc usually have triangular cross-members to add strength to the structure.
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Many shapes have more than one line of symmetry. These include a rectangle, equilateral triangle, and a square. While a rectangle has two lines of symmetry, an equilateral triangle has three.
it is possible, if the triangle is bigger than the rectangle, for example the rectangle has a base of 5 and height of 2-- so the area is 10; and then the triangle has a base of 5 and a height of 4-- the area is also 10.
The triangle is the only one.
i dont think there is one but i want to be sure
A circles structural shape is in fact stronger than a triangles structural geometric shape.